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Overlap of habitat suitability (HS) maps obtained with ecological niche factor analysis (ENFA) using the set of four variables identified as the most relevant for the distribution of the three species (see text). (A–D) Overlap of HS maps between S. boivinii and S. genistoides (A), S. boivinii and S. spectabilis (B), S. genistoides and S. spectabilis (C) and the three species (D), after reclassification using the continuous Boyce index.
